ImOpenLinesManager::getWebFormIdsByPage

protected function getWebFormIdsByPage(Page $page): array
{
	$result = [];

	$landingPageId = $page->getLandingId();
	if ($landingPageId > 0)
	{
		$forms = LandingManager::getInstance()->getConnectedWebForms();
		foreach ($forms as $form)
		{
			$landingWebForm = (int)$form['formId'];
			if (
				$landingPageId === (int)$form['landingId'] &&
				!in_array($landingWebForm, $result, true)
			)
			{
				$result[] = $landingWebForm;
			}
		}
	}

	return $result;
}